Fiber plaster-board and process of making the same



C. G. MUENCH. FIBER PLASTER BOARD AND PROCESS OF MAKING THE SAME.

Patented Apr. 20, 1920.

APPLICATION FILED JUNE 17, 1919. 1,337,254.

UNITED STATES PATENT OFFICE.

CARL G. .MUENCH', OF INTERNATIONAL FALLS, MINNESOTA.

FIBER PLASTER-BOARD AND PROCESS MAKING THE SAME.

Application filed June 17,

To all whom it may concern:

Be it known that I, CARL G. MUENCH, a citizen of the United States, residing at International Falls, in the county of Koochiching and State of Minnesota, have invented certain new and useful Improvements in 'Fiber Plaster-Board and Processes of Making the Same; and I do herebydeclare the following to be a full, clear, and exact description of the invention, such as will combinations of steps constituting the process, and in the novel board resulting therefrom, all as will be more fully hereinafter disclosed and particularly pointed out in the claims.

Referring to the accompanying drawings forming a part of this specification in which like numerals designate like parts in all the views Figure 1 is a diagrammatic cross sectional view of a portion of a fiber pulp board, illustrating the first step in the process forming part of the present invention;

Fig. 2 is a view similar to Fig. 1, illustrating the second step in the present proc ess- Fig. 3 is a view similar to Figs. 1 and 2,

illustrating the final step in the process; and

Fi 4 is a fragmentar perspective view of th e finished board. y In carrying out the present processI first produce a board havin a cross section substantially as shown in ig. 1, wherein 1 designates the body portion of the said board, one side 2 of which is practically flat and smooth, while the other side 3 is provided Specification'of Letters Patent.

Patented Apr. 20, 1920. 1919. Serial No. 304,868.

still moist, it is passed beneath a set of V-shaped indenting rolls 5, which act upon the top surface 6 of the ribs 4, as shown in Fig. 2, to produce a V-shaped channel 7 therein. 'The said ribs are then subjected to the action of a second set of rolls, such as 8, Fig. 3, which again flatten out the surface 6 of the said ribs, whereby the sides 9 thereof, which have up to the present operation been substantially perpendicular to the surface 3 of the board 1, are forced or bent over to form an acute angle with the said surface 3.

It results from what has just been said that the ribs 4 now constitute dove-tail tenons, the sides 9 of which are inclined to each other as shown in Fig. 4, while the grooves or spaceslO between the said ribs or tenons are likewise clove-tail in shape as clearly shown in said figure. The moisture. still remaining in the board is next removed by running the same through a suitable drier, preferably of the moist air type, after which if desired, one or both sides of the finished board may be painted, or sprayed with asphalt, wax, or other suitable material to harden and protect the surface.

The board is now ready for use and may be nailed'or otherwise secured to the studding or other portion of a building, with its grooved face outward, after which plaster, stucco, or other finishing material may be applied to said grooved face. The said plaster or stucco will of course enter the grooves or recesses 10 to form a bond with the board, which, owing to the dovetail shape of the said grooves, is practically impossible to destroy unintentionally.

The pulp board above disclosed, not only forms an excellent substitute for lath, as will be readily apparent, but also serves to make the Walls ,of the building more impervious to temperature changes. boards such as that above disclosed are very good thermal insulators, and the board 1 therefore performs the double function of a lath substitute and a heat insulator.

The board may if desired be suitably waterproofed and fireproofed in the course of construction, or after it is finished, but such a step forms no especial part of the present invention and therefore need not be gone into in detail.

It will also be apparent that if desired the ribs 4 need not be made continuous, but that by suitably designing the felting roller hat is to say, fiber the said ribs may be interruptedat predetermined points, or in other words be made in the form of projections or-blocks, the ,sides of which may be re'adil inclined in the manner above indicated. lso, that by suitably shaping the rollers 5 only oneof the side details of the board constituting the product,

without departing from the splrit of the invention and therefore I do not Wish to be limited to the above disclosure except as may v be required by the claims.

What I claim is 1. The process of making plaster board which consists in felting cellulose fibrous material to form a board having substantially rectangular projections; and subject ing said board while in a moist condition to.

the action of forming rolls, whereby the contour of said projections is changed, substantially as described.

2. The process of making plaster board which consists in felting cellulose fibrous material to form a board having substantially rectangular ribs; and subjecting said ribs to the action of successive sets of forming rolls whereby their cross section is changed to provide a better plaster bond,

substantially'as described.

3. The process of making plaster board which consists in felting cellulose fibrous vmaterial to form a board having substantially rectangular ribs upon one of its surfaces; and subjecting said ribs While the board is still moist to the action of a plurality of sets of forming rolls to change said ribs to a dove tail shape, whereby a "better plaster bond is secured, substantially as described.

. 4. The process of making plaster board which consists in felting cellulose fibrous material to form a board having ribs with substantially parallel sides upon one of its surfaces; subjecting the top surface of said ribs while moist to the action of a set of indentingrolls, whereby a V-shaped channel is formed in said surface; subjecting said surfaceto the action of a second set of rolls,

whereby said channel is removed and said parallel sides are made to assume an angular relation to one another; suitably drying the board; and coating it with a vprotecting material, substantially as described.

v 5. As a new article of manufacture, a plaster board of felted cellulose fibrous material consisting of wood pulp tailings, and having a protecting coating and projections with overhanging angularly disposed sides adapted to 'form a plaster bond upon one of its surfaces, substantially as described.

6. As a new article of manufacture, a plaster board of felted cellulose fibrous material, comprising wood pulp tailings, and provided with a protecting coating, and hav ing compressed dove tail ribs adapted to forma plaster bond upon one of its surfaces, substantially as described.

In testimony whereof I afiix my signature,

in presence of two witnesses.

,CARL G. MUENCH.

Witnesses:

CARI. EIssINGER, W. E. OMA LEr. 

